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She said: “The most notable day is Saturday, where because of a warm air mass moving up from the Continent, we are expecting some potentially heavy and thundery downpours. There is also a chance that parts of the south-east could see the warmest temperatures of the year so far.

“From Friday night into Saturday there is an area of low pressure bringing potentially thundery rain in through the south-west moving north-eastwards throughout the day.

“The south-east, however could still see some good bright sunny spells and temperatures could rise to the mid to perhaps locally high 20 degrees Celsius.”